meaning the opposite of clockwise
. That is, counterclockwise is a rotation to the left and up, a direction opposite the rotation to the right and down of a typical wall clock
's hands. Counterclockwise is also sometimes called widdershins
Typically, screws and bolts are loosened counterclockwise and tightened clockwise. One mnemonic for remembering this is "righty-tighty, lefty-loosey" (right to tighten, left to loosen.)
Occasionally, clocks whose hands revolve counterclockwise are sold as a novelty.
In trigonometry, an angle in standard position is measured counterclockwise from the x-axis.
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